期刊
SOLID STATE SCIENCES
卷 21, 期 -, 页码 11-18出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2013.03.021
关键词
Cadmium selenide; DFT; Strain; Wurtzite CdSe; Electronic band structure; Optical properties
资金
- Research Center of College of Science at King Saudi University
First-principles density functional theory was used to investigate effects of in-plane strains on the structural, electronic, and optical properties of wurtzite cadmium selenide (CdSe). The results of this work show some interesting properties of this material under finite strains that do not exist in the bulk unstrained regime. The structural deformation produced by increasing the in-plane strain, including the internal parameter u, was examined. The result shows that the structure undergoes a phase transition at a strain of 9.3% due to an extraordinary increase of the internal parameter u. By analyzing the electronic band structure using the modified Becke-Johnson approximation (mBJ), a direct-indirect band gap transition at an in-plane strain of 9.3% was found. Additionally, optical dielectric constants, reflectivity, and refractive index were calculated at different values of the strain. These results indicate that, by controlling the CdSe biaxial in-plane lattice constant (for example, by epitaxial growth on an appropriate substrate), the electronic and optical properties can be tuned for specific device applications. (C) 2013 Elsevier Masson SAS. All rights reserved.
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